Adjustable taper-pin box-tool.



T. W. CHAPMAN. ADJUSTABLE TAPER PIN BOX TOOL.

APPLICATION FILED JAN.9,1911.

Patented May 12, 1914.

Ems/via)" Tie/-01 CZA U a COLUMBIA PLANOGRAPH c0., WASHINGTON. n c.

UNITED STATES PATENT @FFTQE.

THERON W. CHAPMAN, OF IBELVICDERE, ILLINOIS, ASSIGNOR TO NATIONAL SEWINGMACHINE COMPANY, OF BELVIDER-E, ILLINOIS, A CORPORATION OF ILLINOIS.

ADJUSTABLE [PAPER-PIN BOX-TOOL.

Specification of Letters Patent.

Patented May 12, 1914.

' '0 all whom it may concern:

Be it known that I, THERON W. CHAP- aux. a citizen of the United States,residing at Belvidere, in the county of Boone and State of Illinois,have invented certain new and useful Improvements in AdjustableTaper-Pin Box-Tools, of which the following is a specification.

This invention relates to a taper pin box tool more particularlydescribed as a devlcc for a turret lathe, and the principal object is toprovide a tool of this character for attachment in the lathe to turntaper pins from bar stock.

Another object is to provide a cutting tool of this character whichmoves deeper in the work as the holder is advanced and quickly andautomatically withdraws the tool when the direction of motion of theholder is reversed.

Another object is to provide improved bearing stops for centering barstock.

Another object is to provide a device of this character which shall beeasily and readily adjustable.

Other objects will appear hereinafter, the novel combination andarrangement of the parts being set forth in the claims. 7

In the accompanying drawings Figure 1 is a plan view of my inventionshowing a holder in position against an inclined fixed rest. Fig. 2 isan end view of the same. Fig. 3 is a side view showing the position ofthe attachment, and Fig. 1 is a view showing the position and locationof one of the bearing stops.

Referring now more particularly to the drawings, the holder 10, providedwith a bored projection 11 with which the holder is adapted to besecured in a turret head, is also provided with an end projection 12 inwhich is an opening 13. The bar stock from which the taper pins are tobe out projects through this opening 13 in the end projection 12 and iscentered by means of centering devices 1%. These centering devicescomprise an adjustable screw 8 which bears against a slotted L-shapedmember 9 whlch in turn bears against the material to be cut designatedin the drawing by the numeral 15. This holder 10 is formed withdove-tailed grooves 16 (Fig. 3) in which the tool mount 17 is adapted toslide transversely of the holder. The tool mount is provided with aholder 20 for the tool 18 and an adjusting screw 19 bears against theend of the tool to vary the positionthereof. At the side of the holder10 is a perforated lug 21 through which the rod 22 extends. This rod 22is adapted to pass freely through an opening 23 in the tool mount 17 andis provided with a threaded end to secure it in the bottom of the saidopening 23. At the other end of the rod which extends through the lug 21are the lock nuts 21 and positioned about the rod 22 in the opening 23is the spring 25 which bears against the lug 21 and the tool mount 17tending to force the latter away from the lug and the cutter 18 held bythe tool mount away from the cutting position. The movement in thisdirection is limited by the position of the lock nuts on the rod 22which strike against the lug 21 when the tool mount is moved too far. Atthe other side of the tool mount is a slotted lug 26 in which is pivotedthe irregular dog 27. This dog 27 bears against the inclined rest 28which is adapted to be secure-d to the bed of the lathe and is fixedwith respect to the holder 10. This inclined rest is provided with slots29 and adjusting screws 30 by means of which, in connection withthesecuring means 31, the inclination of the rest may be changed to anydesired angle. The irregular dog is formed with two bearing points orplanes 32 and 33. These points and 33 are so disposed with respect tothe pivotal mount-- ing 34. that the bearing point 32 engages theinclined rest 28 when the holder 10 is moved in one direction, the toolmount 17 which carries the dog being pressed toward the rest 28 by thespring When, however, the direction of motion of the holder 10 ischanged the dog 27 is turned in such a manner that the point or plane 33bears upon the rest 28. The distance of this plane from the pivotalmounting 3 1 is less than that of the bearing point 32 and when the dogis turned to bear upon this plane 33, the spring 25 operates to pressthe tool mount 17 in the direction of the rest. It will thus be seenthat as the holder 10 advances, the tool 18 is pressed into the bar 15in accordance with the inclination of the rest 28. When the holder 10 iswithdrawn the tool mount 17 is thrust back and with it the tool 18 toclear the bar 15. The dotted outline 10 shows the position of theholder, and 17 shows the position of the tool mount when the holder isWithdrawn. It Will also be noted that the bar 15 is held in a centralposition against the deflecting influence of the cutting tool 18regardless oi the depth of the out. When the taper pin is longer thanthe Width of the tool mount 17 it may extend into the bored-out opening11 in the projection 11.

hat I claim as new is- 1. In a taper pin cutting device, the combinationof a longitudinally movable holder, a tool mount transversely slidablein the holder, a perforated projection on the edge of the holder, athreaded pin With one end secured to the tool mount and freely mo 'ahlethrough the said perforation, look nuts at the other end of the pinconstituting a stop limit for said tool mount, an annular opening in thetool mount about the body of the pin, and a coil spring surrounding thepin in the annular opening and bearing against; the said projection andthe tool mount.

2. In a taper pin cutting device, the combination of a longitudinallymovable holder, a tool. mount transversely slidable in the holder, anadjustably mounted inclined guide fixed with respect to the tool mount,a slotted lug projecting from the tool mount, and a freely movableirregular dog pivoted therein and having one bearing surface againstsaid guide when the holder is moved in one direction and another bearingsurface when it is moved in the opposite direction, said surfaces beingat difi'erent distances from the pivotal point.

In testimony whereof I hI/UG signed my name to this specification, inthe presence of tWo subscribing Witnesses, on this 28 day of December A.D. 1910.

THERON W. CHAPMAN.

\Vitnesses:

C. B. Arwoon, JOHN ELonnnoE.

Copies of this patent may be obtained for five cents each, by addressingthe Commissioner of Patents, Washington, D. G.

